Markdown

When using RedCarpet, Middleman will handle links and image tags with its own
helpers, meaning things like :relative_links and :asset_hash will do what
you expect. However, the default Markdown engine is Kramdown because it's easier
to install.

Other Templating Languages

Here is the list of Tilt-enabled templating languages and the RubyGems which
must be installed (and required in config.rb) for them to work (this list is
from Tilt):